3.7.90
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GTK3:
  Add support for styling of header bar widgets
  Add support fof OSD buttons in a GtkOverlay
  Improve style for pressed OSD buttons
  Update gedit search slider CSS
  Added a style for Contacts' selection toolbar
  Fix Epiphany's toolbar buttons in dark theme
GTK2:
  Fix a regression in drawing Libreoffice/OO.o GtkEntry backgrounds
  Don't render a stroke for GTK_SHADOW_NONE frames